release: v0.0.2

docs(readme): revise readme with expanded cli and manifest docs (#7)

* docs(readme): revise readme with expanded cli and manifest docs

rework README content to clarify CLI usage, expand command examples,
and update the manifest format. summarize key changes:

- replace warning block with callout style
- reorganize quick start to show init, add/install flows and re-install
  behavior
- clarify `agentfiles install` semantics: first `install <source>` scans
  and saves the source as a dependency; `agentfiles install` with no
  args re-installs saved deps
- document new flags: `--pick`, `--no-save`, `--dry-run` and clarify
  `--strategy` applies per-dependency
- add `agentfiles list` and `agentfiles remove` command docs (with
  `--clean`)
- update manifest docs: `files` -> `dependencies`, add simple string and
  detailed dependency forms (`source`, `ref`, `pick`, `strategy`,
  `paths`)
- update examples throughout to match the new manifest and CLI behavior

these are documentation-only changes; no code or tests modified.

* ci(github): limit pr workflow runs to relevant files

add a paths filter to pull_request so the workflow only triggers when
the
CI workflow, Cargo manifest/lock, or source files change (
.github/workflows/ci.yml, Cargo.toml, Cargo.lock, src/**). reduce
unnecessary CI runs for unrelated changes.